#!/sw/bin/perl5 -w

#----------------------------------------------------------------#
# This script updates a file with a valid internal header to
# a file with a public header.
# It does the following things:
# it adds a release number and date
# it removes email addresses from authors
# it adds the public license
#----------------------------------------------------------------#

use strict;
#use Cwd;
use File::Copy;
#use File::Basename;
#use File::Find;
use Getopt::Std;

sub usage()
{
    print STDERR<<"EOF";
usage:
  $0 -h
      show this message and quit

  $0 -v version [-d date] file1 ...
  $0 -v version [-d date] -f filenames_file

    -v version of the release (compulsory)
    -d date of the release (default: today)
    The filenames may either be given on the command line
    or may be listed in a file, one name per line.

EOF
}

sub gjmove($$)
{
    return 1 if rename($_[0], $_[1] );
    return (system('mv', "$_[0]", "$_[1]") == 0);
}

#----------------------------------------------------------------#
#                     initialization                             #
#----------------------------------------------------------------#

my $TEMPFILE;



sub print_license()
{
    print TEMPFILE <<'END_OF_LICENSE';

// This software and related documentation is part of the Computational
// Geometry Algorithms Library (CGAL).
// This software and documentation is provided "as-is" and without warranty
// of any kind. In no event shall the CGAL Consortium be liable for any
// damage of any kind. 
//
// Every use of CGAL requires a license. 
//
// Academic research and teaching license
// - For academic research and teaching purposes, permission to use and copy
//   the software and its documentation is hereby granted free of charge,
//   provided that it is not a component of a commercial product, and this
//   notice appears in all copies of the software and related documentation. 
//
// Commercial licenses
// - A commercial license is available through Algorithmic Solutions, who also
//   markets LEDA (http://www.algorithmic-solutions.de). 
// - Commercial users may apply for an evaluation license by writing to
//   Algorithmic Solutions (contact@algorithmic-solutions.com). 
//
// The CGAL Consortium consists of Utrecht University (The Netherlands),
// ETH Zurich (Switzerland), Free University of Berlin (Germany),
// INRIA Sophia-Antipolis (France), Martin-Luther-University Halle-Wittenberg
// (Germany), Max-Planck-Institute Saarbruecken (Germany), RISC Linz (Austria),
// and Tel-Aviv University (Israel).
//
END_OF_LICENSE
}


#----------------------------------------------------------------#
#                     check_and_update_2                         #
#----------------------------------------------------------------#

sub check_and_update_2($$$)
{
    my ($version, $date, $filename) = @_;
    my $warnings = 0;
    my $header_position = 1;
# 1:before header; 2: in first part; 3: in second part 4: after header.

    while ( <SOURCE_FILE> ) {
	print TEMPFILE $_;
	if ( m|^\s*//\s*={10,}\s*$| ) {
	    $header_position = 2;
	    last;
	}
    }
    if ($header_position != 2) {
	print FILE_CHECKS "$filename has no header.\n";
	return 0;
    }
    print TEMPFILE "//\n";
    $_ = <SOURCE_FILE>;
    $_ = <SOURCE_FILE> while (m|^\s*//\s*$|);
    if ($_ !~ m<^\s*//\s*Copyright\s*\(c\)\s*\d{4}(,\s?\d{4})*\s+(t|T)he CGAL Consortium\s*$> ) {
	print FILE_CHECKS "$filename has no valid copyright notice.\n";
	return 0;
    }
    print TEMPFILE $_;
    print_license;
    while ( <SOURCE_FILE> ) {
	if (m|^\s*//\s*-{10,}\s*$|) {
	    $header_position = 3;
	    last;
	}
    }
    if ($header_position != 3) {
	print FILE_CHECKS "$filename has an incorrect header.\n";
	print FILE_CHECKS "The line with dashes (----) is missing.\n";
	return 0;
    }
    print TEMPFILE "// ", '-' x 70,"\n";

    while ( <SOURCE_FILE> ) {
	if ( m|^\s*//\s*={10,}\s*$| ) {
	    $header_position = 4;
	    last;
	}
	if ( m<^\s*//\s*maintainer\s*:> ) {
	    next;
	}
	if ( m<^\s*//\s*email\s*:> ) {
	    next;
	}
	next if ($_ !~ m|^\s*//| );
	if ( m<^\s*//\s*release\s*:> ) {
	    print TEMPFILE "// release       : $version\n";
	    next;
	}
	if ( m<^\s*//\s*release_date\s*:> ) {
	    print TEMPFILE "// release_date  : $date\n";
	    next;
	}
	s/([\w]+)\s*<[-\w\.\s]+\@{1,2}[-\w\.\s]+>/$1/g;
	s/([\w]+)\s*\([-\w\.\s]+\@{1,2}[-\w\.\s]+\)/$1/g;
	s/([\w]+)\@{1,2}[-\w\.]+/$1/g;
	if ( m/\@/) {
	    print FILE_CHECKS "In $filename remains a  @ sign.\n   ";
	    print FILE_CHECKS $_;
	}
	print TEMPFILE $_;
    }
    if ($header_position != 4) {
	print FILE_CHECKS "Header of $filename does not end.\n";
	return 0;
    }
    print TEMPFILE '// email         : contact@cgal.org',"\n";
    print TEMPFILE '// www           : http://www.cgal.org',"\n//\n";
    print TEMPFILE "// ", '=' x 70,"\n";


    my ($lines_exceeding_length, $has_line_directives) = (0, 0);
    while ( <SOURCE_FILE> ) {
	print TEMPFILE $_;
    }
    return 2;
}

sub check_and_update_file($$$)
{
    my ($filename, $version, $date) = @_;
    my $check_status;
    if (! -r $filename) {
	print FILE_CHECKS "$filename is not a readable file.\n";
	return;
    }
    open SOURCE_FILE, "<$filename" || die "Error opening $filename: $!\n";
    open TEMPFILE, ">$TEMPFILE" || die;
    $check_status =check_and_update_2($version, $date, $filename);
    close SOURCE_FILE || die "Error closing $filename: $!";
    close TEMPFILE || die "Error closing temporary file: $!\n";
    if ($check_status == 0) {
	print FILE_CHECKS "Header check failed for $filename.\n";
    } else {
	gjmove($TEMPFILE, $filename )
	|| warn "Could not update file $filename\n";
    }
}


sub main()
{
    umask(002);
    
    getopts('hv:d:f:');
    if ($::opt_h ) {
	usage;
	return;
    }
    $::opt_h = 0;
    if (!$::opt_v) {
	usage;
	die "Error: no -v option present.\n";
    }
    $TEMPFILE="tmp.$$";
    if ( ! $::opt_d ) {
	$::opt_d = `date '+%Y, %B %d'`;
	chomp $::opt_d;
    }
    open FILE_CHECKS, ">-";
    my $filename;
    if ( $::opt_f ) {
	open FILENAMES, "$::opt_f";
	while (defined($filename=<FILENAMES>)) {
	    chomp $filename;
	    check_and_update_file($filename, $::opt_v, $::opt_d);
	}
	close FILENAMES;
    } else {
	foreach $filename (@ARGV) {
	    check_and_update_file($filename, $::opt_v, $::opt_d);
	}
    }
    close  FILE_CHECKS;
}

main;